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Income Taxes - Schedule of Loss Carryforwards (Detail) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deductible temporary differences | $ 13.0 | $ 12.8
Non-capital tax losses [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Capital tax losses | 100.8 | 88.5
Non-capital tax losses [member] | Expiry 2019 To 2038 [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Capital tax losses | 27.4 | 16.3
Non-capital tax losses [member] | Never expire [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Capital tax losses | 73.4 | 72.2
Capital tax loss [member] | Never expire [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Capital tax losses | 9.3 | 5.5
Non-capital and capital tax losses [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Capital tax losses | $ 123.1 | $ 106.8

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